- TETRAD
- Foursome
- Four-part structure
- EGOT, e.g.
- Multiple choice answers, often
- Aces in a deck, e.g.
- Quartet
- Any foursome
- Square sides, for example
- Sung on, with "out"
- Seasons in the year, e.g.
- Four of a kind
- The Fantastic Four, for example
- Group of four
- Monopoly's railroads, e.g.
- Four-note chord
- The classical elements, e.g.
- Brahms' symphonies, e.g.
- Polo team, for instance
- The number four.
- Collection of four.
- Four.
- Chord.
- Quaternion.
- Four of a kind, say
- Fourfold
- The women in "Little Women," e.g.
- Cat's paws, e.g.
- Covalent bonds of a carbon atom, e.g.
- Half of an octet
- Golf group often
- Trio plus one
- The Horsemen of the Apocalypse, e.g.
- Gift of calling birds, say
